Dresden 2026 – wissenschaftliches Programm

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 5: Plasma Accelerators, Ions I

AKBP 5.1: Topical Talk

Dienstag, 10. März 2026, 09:30–10:00, SCH/A117

Generation and Acceleration of In-Target Gold Fission Fragments using the ATLAS-3000 Laser System — •Laura D. Geulig, Veronika Kratzer, Erin Grace Fitzpatrick, Maximilian J. Weiser, Jörg Schreiber, and Peter G. Thirolf — Ludwig-Maximilians University Munich

In our experiment, the ATLAS-3000 laser system was used to accelerate ions from heated micrometer thing gold foils. A Thomson parabola spectrometer, optimized for high-resolution detection of heavy ions, was used to deflect ions with the same charge-to-mass (m/q) ratio on parabolic traces, which then can be matched to the ions with respective charge states. CR-39 track detectors were used to identify and characterize the accelerated ion species via their energy and charge states. In addition to remaining light contaminant species and highly-charged gold ions, an unexpected component of heavy (A 98) ions was observed in the m/q range below 2.5. We attributed those distinct pits to Au fission products. A similar in-target fission fragment component was observed in our previous experiment at the PHELIX laser. Details on our interpretation of the origin of these fragments will be presented.

Keywords: Fission-Fusion Scheme; TNSA; laser-based acceleration; r-process; ultra-high intensity lasers